Atomic Structure Practice Questions
JEE · Chemistry · 1549 free MCQs with instant results and detailed explanations.
1549
Total
306
Easy
671
Medium
572
Hard
Start Practicing Atomic Structure
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Topics in Atomic Structure
Quantum Mechanics
120
Electronic Configuration
171
Periodic Properties
174
Bohr Model
160
Quantum Mechanical Model
155
Quantum Numbers
143
Electron Configuration
160
Photoelectric Effect
131
de Broglie
167
Heisenberg
168
Sample Questions from Atomic Structure
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
What is the principal quantum number for an electron in the second energy level?
A.
1
B.
2
C.
3
D.
4
Show Answer & Explanation
Correct Answer: B
The principal quantum number (n) indicates the main energy level of an electron. For the second energy level, n=2.
Q2
Easy
Which of the following quantum numbers can never be negative?
A.
Principal quantum number
B.
Azimuthal quantum number
C.
Magnetic quantum number
D.
Spin quantum number
Show Answer & Explanation
Correct Answer: A
The principal quantum number (n) must be a positive integer (1, 2, 3,...), and cannot take negative values.
Q3
Easy
The maximum number of electrons that can occupy a d-subshell is:
A.
2
B.
6
C.
10
D.
14
Show Answer & Explanation
Correct Answer: C
A d-subshell can hold a maximum of 10 electrons because it has 5 orbitals (each can hold 2 electrons).
Q4
Medium
In the context of quantum mechanics, which of the following statements about the Schrödinger equation is NOT true?
A.
It describes how the quantum state of a physical system changes over time.
B.
It can be used to calculate the probability density of finding a particle in a given region.
C.
It is a deterministic equation that can predict exact positions of particles.
D.
The solutions to the Schrödinger equation are wave functions.
Show Answer & Explanation
Correct Answer: C
The Schrödinger equation provides probabilities but cannot predict exact positions, making it a probabilistic model.
Q5
Medium
In which of the following transitions will the electron absorb energy?
A.
n=2 to n=1
B.
n=3 to n=4
C.
n=1 to n=2
D.
n=4 to n=3
Show Answer & Explanation
Correct Answer: C
An electron absorbs energy when it moves from a lower energy level (n=1) to a higher energy level (n=2).
Q6
Medium
What is the value of the principal quantum number for the valence shell of chlorine?
A.
2
B.
3
C.
5
D.
1
Show Answer & Explanation
Correct Answer: B
Chlorine has an atomic number of 17, and its valence electrons are in the third shell, thus the principal quantum number is 3.
Q7
Medium
What does the magnetic quantum number (m) indicate about an orbital?
A.
Size of the orbital
B.
Shape of the orbital
C.
Orientation of the orbital
D.
Energy of the orbital
Show Answer & Explanation
Correct Answer: C
The magnetic quantum number (m) indicates the orientation of an orbital in space relative to the three axes.
Q8
Hard
What is the maximum number of electrons that can occupy a d-subshell?
A.
10
B.
14
C.
6
D.
2
Show Answer & Explanation
Correct Answer: A
A d-subshell can hold a maximum of 10 electrons, as it has five orbitals, each capable of holding two electrons.
Q9
Hard
Which of the following quantum numbers can describe the shape of an orbital?
A.
Principal quantum number (n)
B.
Azimuthal quantum number (l)
C.
Magnetic quantum number (m_l)
D.
Spin quantum number (m_s)
Show Answer & Explanation
Correct Answer: B
The azimuthal quantum number (l) defines the shape of an orbital, with values ranging from 0 to n-1.
Q10
Hard
In quantum mechanics, which principle explains that two identical fermions cannot occupy the same quantum state?
A.
Heisenberg uncertainty principle
B.
Pauli exclusion principle
C.
Aufbau principle
D.
Hund's rule
Show Answer & Explanation
Correct Answer: B
The Pauli exclusion principle states that no two identical fermions can occupy the same quantum state simultaneously.
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Atomic Structure — JEE Chemistry Practice Questions Online
This page contains 1549 practice MCQs for the chapter Atomic Structure in JEE Chemistry. The questions are organized by difficulty — 306 easy, 671 medium, 572 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 10 topics, giving you comprehensive coverage of the entire chapter.